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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Jan. 31, 2021 | Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Increase in liability as a result of increasing the profit element and risk premium input by 100 basis points |  | $ 400 |  |  |
Decrease in liability as a result of decreasing the profit element and risk premium input by 100 basis points |  | 400 |  |  |
Increase in liability as a result of decreasing the discount rate by 100 basis points |  | 2,200 |  |  |
Decrease in liability as a result of increasing the discount rate by 100 basis points |  | 2,500 |  |  |
Investments in debt securities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value adjustments included in other (expense) income, net | $ 784 | 3,153 |  |  |
Debt Securities, One |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Investments in debt securities |  |  |  | $ 25,000 |
Debt Securities, Two |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Investments in debt securities |  |  | $ 20,000 |  |
Debt Securities, Three |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Investments in debt securities | 13,000 | 13,000 |  |  |
Level 2 | Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Investments in debt securities | 0 | 0 |  |  | $ 0
Level 2 | Recurring | Convertible Notes | Convertible Senior Notes Due 2028 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Notes payable fair value | 537,600 | 537,600 |  |  |
Level 2 | Recurring | Convertible Notes | Convertible Senior Notes Due 2026 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Notes payable fair value | 588,600 | 588,600 |  |  |
Level 2 | Recurring | Convertible Notes | Convertible Senior Notes Due 2025 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Notes payable fair value | 206,600 | 206,600 |  |  |
Level 2 | Recurring | Convertible Notes | Convertible Senior Notes Due 2024 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Notes payable fair value | 9,100 | 9,100 |  |  |
Level 3 | Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Investments in debt securities | $ 61,153 | $ 61,153 |  |  | $ 0

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